Cylindrical three-step filter



FIG. 1 is a perspective view of a cylindrical three-step filter in accordance with the present design;

FIG. 2 is a front view of the cylindrical three-step filter of FIG. 1;

FIG. 3 is a rear view of the cylindrical three-step filter of FIG. 1;

FIG. 4 is a bottom view of the cylindrical three-step filter of FIG. 1;

FIG. 5 is a top view of the cylindrical three-step filter of FIG. 1;

FIG. 6 is a left side view of the cylindrical three-step filter of FIG. 1; and,

FIG. 7 is a right side view of the cylindrical three-step filter of FIG. 1. 

CLAIM The ornamental design for a cylindrical three-step filter, as shown and described. 